An association between living organisms in which one lives on and feeds at the expense of the other is known as
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The association between living organisms in which one lives on and feeds at the expense of the other is called parasitism. In this relationship, one organism (the parasite) benefits while the other organism (the host) is harmed. The parasite lives on or within the host and uses its resources for food and shelter. Examples of parasites include tapeworms, lice, and mosquitoes.